Master Bond LED405FL3 is reportedly a flexible, one-component, LED-curing adhesive system with excellent optical clarity and a refractive index of 1.51. Its flexibility allows for stress minimization, especially when bonding substrates with different coefficients of thermal expansion. It also utilizes a fluorescent dye for detection purposes, which enables easy visual inspection.

The company reports that this no-mix system achieves full tack-free cure following exposure to a 405-nm wavelength light source without any oxygen inhibition. In thinner sections, full cures can be achieved in 30-45 seconds. The rate of cure depends on the intensity of the light source, the thickness of the adhesive layer, and the distance from the light to the adhesive.

LED405FL3 is serviceable from -100 to 250°F. It cures with a hardness of around 5-15 Shore D at room temperature. Additional performance properties include electrical insulation as well as resistance to thermal cycling, shock, and vibration.

LED405FL3 is a low-viscosity system that can be used for small potting and encapsulation applications, assuming that there are no shadows or concealed areas. The solvent-free, RoHS-compliant compound is available in syringes, ½ pint, pint, and quart containers.

Learn more at